The plot might involve Harry trying to hide his true identity as a Mikaelson. He could struggle with the fact that he's different from other wizards. His relationship with his friends, like Hermione and Ron, could be strained as he tries to keep this secret. Also, the Mikaelson family might try to get him involved in their vampire world affairs, which would create a whole new set of challenges for Harry.
He would probably be more confident. Since the Mikaelsons are known for their assertiveness, Harry might inherit some of that trait. He could be more bold in standing up to his enemies, not just Voldemort but also bullies at Hogwarts.
One idea could be that Rebekah's son discovers a hidden power within him that links to the family's dark past. He might struggle to control it while also trying to fit into the human world. For example, he could accidentally use this power during a school event, causing chaos.
Caroline Forbes would be an excellent ally. She's strong - willed and has a good heart. She could help Rebekah's son navigate the social aspects of the vampire world, like how to handle vampire politics. Also, her friendship with the Mikaelsons could make her a natural protector for Rebekah's son.
Perhaps in the fanfiction, Rebekah is a transfer student from a different magical school. She forms an unlikely friendship with Hermione. Together, they work on a project that combines the magic of the Vampire Diaries' world (where Rebekah is from) and the wizarding world of Harry Potter. This could lead to new spells being discovered. And Rebekah might also have some romantic tension with one of the male characters, like Ron or Draco.
One plot idea could be that Henrik Mikaelson somehow gets transported into the 'Harry Potter' universe. Maybe he has his vampire powers and has to hide them among the wizards. He could form an unlikely friendship with Harry and help him in his battles using his unique abilities.
Rebekah Mikaelson and Hermione would be likely to interact. Hermione is curious and intelligent, and she would be intrigued by Rebekah's different kind of magic. She would probably ask Rebekah a million questions about her vampire nature and the magic in her world. Rebekah, on the other hand, might be a bit annoyed at first but would come to respect Hermione's thirst for knowledge.
Maybe Harry discovers his Mikaelson heritage when strange things start to happen to him during his time at Hogwarts. His newfound powers could attract the attention of both the wizarding world and the supernatural world from Klaus' side, leading to a complex web of alliances and rivalries. He might have to learn how to balance his wizarding skills with his vampire - like abilities.
In such a fanfiction, the plot could involve Harry being hidden from Klaus's enemies in the wizarding world. As he grows up, he discovers his true parentage through some magical or supernatural means. His connection to Klaus might give him unique powers, like enhanced strength and speed along with his magic. He could be caught in a war between the magical community that wants to keep the vampire - werewolf world at bay and Klaus's allies who want to bring Harry into their fold. Harry has to decide which side he truly belongs to and fight for what he believes in, all while trying to understand his complex heritage.
One great Rebekah Mikaelson fanfiction is 'Rebekah's Redemption'. It delves into her complex character, showing her growth and struggles in a new light. The story is well - written, with vivid descriptions that really bring the 'Vampire Diaries' world to life.
One idea could be the baby having unique powers that attract both danger and allies. Maybe the baby's powers are a mystery even to Rebekah at first, and she has to protect it from those who would use it for their own gain. Another plot could be about the baby growing up in a world full of supernatural politics, with Rebekah trying to shield it from the darker aspects of that world. Also, a story where the baby forms an unexpected bond with a character who was initially an enemy could be really interesting.